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8200377: String::strip, String::stripLeading, String::stripTrailing

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Reviewed-by: sundar, rriggs
This commit is contained in:
Jim Laskey 2018-05-14 09:40:48 -03:00
parent ec2d9845e0
commit 7906014509
4 changed files with 300 additions and 1 deletions
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55
src/java.base/share/classes/java/lang/StringUTF16.java
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@ -856,6 +856,61 @@ final class StringUTF16 {
null;
}
public static int indexOfNonWhitespace(byte[] value) {
int length = value.length >> 1;
int left = 0;
while (left < length) {
int codepoint = codePointAt(value, left, length);
if (codepoint != ' ' && codepoint != '\t' && !Character.isWhitespace(codepoint)) {
break;
}
left += Character.charCount(codepoint);
}
return left;
}
public static int lastIndexOfNonWhitespace(byte[] value) {
int length = value.length >> 1;
int right = length;
while (0 < right) {
int codepoint = codePointBefore(value, right);
if (codepoint != ' ' && codepoint != '\t' && !Character.isWhitespace(codepoint)) {
break;
}
right -= Character.charCount(codepoint);
}
return right;
}
public static String strip(byte[] value) {
int length = value.length >> 1;
int left = indexOfNonWhitespace(value);
if (left == length) {
return "";
}
int right = lastIndexOfNonWhitespace(value);
return ((left > 0) || (right < length)) ? newString(value, left, right - left) : null;
}
public static String stripLeading(byte[] value) {
int length = value.length >> 1;
int left = indexOfNonWhitespace(value);
if (left == length) {
return "";
}
return (left != 0) ? newString(value, left, length - left) : null;
}
public static String stripTrailing(byte[] value) {
int length = value.length >> 1;
int right = lastIndexOfNonWhitespace(value);
if (right == 0) {
return "";
}
return (right != length) ? newString(value, 0, right) : null;
}
private static void putChars(byte[] val, int index, char[] str, int off, int end) {
while (off < end) {
putChar(val, index++, str[off++]);